Over the weekend, I borrowed a sit-in kayak from Eric (Yoda) for a try. I was hopping out at a portage and I hung one of my feet in the kayak, with my other foot over the side on the bottom. Then the kayak started drifting out into deeper water, leaving me to hop on one foot to keep up, until it got deep enough that my foot couldn't reach. Then I went upside down, with one foot still hung in the kayak, the other flailing around, and my head underwater with cold river water pouring into my waders. I did that pretty much long enough for everybody fishing along the bank to get a good look and a laugh before my foot pulled out, I got rightside up, and then had to chase down my hat before it floated away.
Oh, and I forgot to put my cell phone in a zip-lock bag in my wader pouch.
I guess I am not quite as impressive as kayak jumping guy.
bd